2K decided to support Switch right out of the gate with both NBA 2K18 and WWE 2K18. In an interview with 2K president David Ismailer at E3, we find out that 2K was quite happy with how these games performed.
"We're really happy with our performance on NBA, and WWE. I think we are going to be continuing supporters of the Switch platform. A lot of the developers are huge fanboys of the Switch platform, so they really love developing for [it]."
This interview was conducted at E3 2018, and since then we've officially learned that WWE 2K19 is not coming to Switch. I guess that continued support Ismailer talked about is going to be quite selective.
Further in the interview, Ismailer addresses the required download for games like NBA 2K18, and says that it didn't impact sales. He also explains why something like this is necessary.
"Our goal is to deliver the exact same experience. We don't want to create a different and bifurcated experience for the Switch platform. In order to accomplish that goal--our games are very big--that was the requirement. If we wanted to deliver a different experience, or I would say a sub-standard experience... But when we initially started development on the Switch, the goal was to deliver the same experience you have on [other] consoles."